Application of polymer cement repair mortar in underground engineering: A review

Yuan, Peilong; Zhang, Baodong; Yang, Yongtai; Jiang, Tengfei; Li, Jie; Qiu, Junling; He, Haijun

doi:10.1016/j.cscm.2023.e02555

Cited by 9 publications

(3 citation statements)

References 75 publications

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“…In this paper, wind screen dust reduction technology is proposed to solve this serious pollution problem. At the same time, the application of this technology should focus on the comparison between the experimental test results and the field data collected in the actual engineering application, which has obtained more objective conclusions [52]. The dust control principle of this technology mainly consists of two air curtain dust removal fans and two deflector covers [53].…”

Section: Improvement Methodsmentioning

confidence: 99%

Ecological Characteristics and Occupational Health Effects of Deep Mines in China: A Review

Shi,

Sun,

Jiang

et al. 2024

Pol. J. Environ. Stud.

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With the depletion of shallow mineral resources, deep shaft mining has become an inevitable trend, but there is a lack of systematic review on the hazards of deep shaft mining ecological environment on miners' occupational health. The aim of this paper is to study the impact and main hazards of deep shaft mining ecological environment on miners' occupational health, summarize the existing research results and reveal their limitations, and put forward the latest targeted improvement technologies. The conclusions show that the environmental characteristics of deep mine dust, noise, and high temperature seriously jeopardize occupational health. Pneumoconiosis has become one of the biggest threats, with nearly 14,000 new cases per year since 2009; harmful noise exposure is widespread in deep mines, directly jeopardizing occupational health, with a detection rate of 29.96% of hearing impairment among China's 480,200,000 miners; and the average ground temperatures at the current mining depths of -1,000 m and -2,000 m are 41.84ºC and 69.62ºC, respectively, which are very likely to trigger a variety of heat-related diseases in miners. Miners with a variety of heat-related illnesses. The hazards of these environmental features are seriously underestimated.

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Section: Improvement Methodsmentioning

confidence: 99%

Ecological Characteristics and Occupational Health Effects of Deep Mines in China: A Review

Shi,

Sun,

Jiang

et al. 2024

Pol. J. Environ. Stud.

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“…Moodi et al [ 24 ] discovered that an appropriate amount of SBR latex not only improves the wear resistance of concrete but also enhances shrinkage and freeze–thaw resistance. However, extensive research [ 19 , 25 ], including the use of polymers like SBR latex, indicates adverse effects on the compressive strength of cement-based materials. Therefore, the combined use of polymers with mineral admixtures, fibers, or nanomaterials has become a new and promising research direction.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Properties of Composite Modified Mortar with Styrene–Butadiene Rubber Latex and Silica Fume

Yan,

Wang,

et al. 2024

Polymers

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To solve the problem of the poor abrasion resistance of concrete pavement surface mortar, this study substituted cement with equal amounts of styrene–butadiene rubber (SBR) latex and silica fume (SF) to investigate the effects of organic/inorganic material composite modification on the fluidity, drying shrinkage, mechanical properties, and abrasion resistance of cement mortar. Also in this study, the microstructure, product, and pore structure characteristics of the composite modified cement mortar were investigated using scanning electron microscope (SEM), X-Ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and the Brunauer–Emmett–Teller (BET) method. This research found that the sole substitution of SF negatively impacted the mortar’s fluidity and drying shrinkage yet enhanced its mechanical strength and abrasion resistance; the incorporation of SBR latex improved fluidity, reduced shrinkage, and increased flexural strength but adversely affected the compressive strength of the mortar. Additionally, the enhancement of the mortar’s abrasion resistance with SBR latex was significantly greater than that with SF. When SBR latex and SF were used together as substitutes, the latex struggled to offset the negative impact of SF on mortar fluidity but effectively reduced shrinkage; SF compensated for the detrimental effect of the latex on compressive strength. Moreover, the primary role in enhancing the mortar’s abrasion resistance was played by the latex. Microscopic tests showed that SBR latex and SF could increase the content of calcium silicate hydrate (C-S-H) gel, inhibit the formation of ettringite (AFt) and reduce carbonation, refine the pore size of cement mortar, and effectively improve the microstructure of mortar.

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“…High compressive strength serves as an indicator of a concrete mixture capable of withstanding substantial loads, thereby contributing significantly to the long-term durability of the structure (Han et al, 2017;Gupta et al, 2021). Conversely, low compressive strength may lead to structural failures, com-promising safety (Yuan et al, 2023), necessitating costly repairs, retrofitting and challenges the durability (Girish et al, 2023). On the other hand, flexural strength denotes the material's capability to resist deformation under bending, specifically the maximum tensile stress it can endure without fracturing when subjected to a bending moment (Marí et al, 2015;Gamil, 2023).…”

Section: Introductionmentioning

confidence: 99%

A Comparative Analysis of Compressive and Flexural Strength in Concrete with Partial Cement Replacement using Waste Glass Powder

Safi,

Behsoodi,

Sharifi

2024

IJMR

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This experimental inquiry delves into the evaluation of compressive and flexural strengths in concrete through the utilization of waste glass powder as a partial substitute for cement. Compressive strength is a key metric, indicating the concrete’s ability to effectively support structural axial loads, while flexural strength signifies its capacity to withstand deformation under bending, specifically the maximum tensile stress it can endure without fracturing when subjected to a bending moment. Certain pozzolanic materials have demonstrated the ability to enhance the mechanical strength of concrete when used as a cement replacement, and waste glass powder is among them. To address this, the experimental investigation included the substitution of cement with glass powder at different proportions (0%, 10%, 15%, 17.5%, and 20%) in both cubic and prismatic samples. Compressive strength and flexural strength tests were made following the curing of the samples for 7, 14, and 28 days. The findings indicated that the 17.5% cement replacement level exhibited a 6.07% over-strength for compressive strength and a 6.85% over-strength for flexural strength on the 28th day. However, the 15% replacement showed superior strength compared to a 10% replacement, and the 10% replacement was stronger than a 0% cement replacement. Notably, the 20% cement replacement displayed negative over-strength percentages, specifically -2.42% in compressive strength and -1.42% in flexural strength on the 28th day. This deviation raises concerns about its suitability for use in concrete applications, signifying that a 20% replacement may not be recommended.

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Application of polymer cement repair mortar in underground engineering: A review

Cited by 9 publications

References 75 publications

Ecological Characteristics and Occupational Health Effects of Deep Mines in China: A Review

Ecological Characteristics and Occupational Health Effects of Deep Mines in China: A Review

A Study on the Properties of Composite Modified Mortar with Styrene–Butadiene Rubber Latex and Silica Fume

A Comparative Analysis of Compressive and Flexural Strength in Concrete with Partial Cement Replacement using Waste Glass Powder

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